#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	int n;
	while (scanf("%d",&n)!=EOF)
	{
		for (int i = 0; i < n; i++)
		{
			for (int j = 0; j < n; j++)
			{
				if (i == 0 || i == n - 1||j==0 ||j==n-1)
					printf("* ");
				else
					printf("  ");
            }
			printf("\n");
		}	
	}
	return 0;
 }